package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import nonapi.io.github.classgraph.utils.Join;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){

    }
    /**
     * 定义一个前置通知,为公共字段赋值
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段填充...");
        //获取当前被拦截的方法上的数据库操作类型
        MethodSignature signature= (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill=signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();//获得数据库操作类型
        //获取到当前被拦截的方法的参数————实体对象
        Object[] args=joinPoint.getArgs();
        if(args==null||args.length==0){
            return;
        }
        Object entity = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentID= BaseContext.getCurrentId();
        //根据当前不同的操作类型，为对印的属性通过反射来获取值
        if(operationType==OperationType.INSERT){
            //为这四个公共字段来赋值
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性来赋值
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentID);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentID);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else if(operationType==OperationType.UPDATE){
            //为两个公共字段来赋值
            try {
               Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                //通过反射为对象属性来赋值
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentID);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }

    }
}
